The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substnace B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B,C and D?

Iron powder and sulphur powder were mixed together were mixed together and divided into two parts A and B. when part A was heated strongly over a burner , then a substance C was formed , the part B was however , not heated at all .when dilute hydrochloric acid was added to substance C , then gas D was evolved and when dilute hydrochloric acid was added to part B them gas E was evolved . (a) what type of substance is B ? (b) what type of substance is c? (c ) Name the gas (i ) D, and (ii) E (d) state one characteristic property fo gas D. (e ) Write one test to identify gas E.

The aqueous solution of a salt (A) is alkaline. When (A) is heated strongly, it swells up and melts to give a transparent bead. When the bead is heated with a sulphate salt (C), the bead becomes deep blue in colour. A white crystalline compound (D) is obtained when concentrated H_2SO_4 is added to a hot solution of (A). Identify (A), (B), (C) and (D) and give the reactions involved.

When a blue coloured copper salt is heated strongly, it forms a white copper salt. The white copper salt can be reconverted into blue salt by adding a liquid X. (a) Write the formula of blue copper salt. (b) Write the formula of white copper salt. (c) What substance is lost when blue copper salt is converted into white copper salt? (d) Name the liquid X.

A blue - coloured salt becomes white on heating. Give reason for the above observation. What happens when we add water to the salt obtained after heating ? Also write its formula.

(a) What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation. (b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.

A silver-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to from a white powder Y. When is added to powder Y, it dissolves partially to from another substance Z. (a) What could metal X be ? (b) What is powder Y ? (c ) With which substance metal X combines to from powder Y ? (d) What is substance Z ? Name one domestic use of substance Z. (e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to from powder Y.

When A + Water to C + B, B is reacted with D, gas C again obtained. 'D' gives 'C' with H_(2)SO_(4) . B gives yellow colour with bunsen flame. C is a flamable gas then what would be A, B, C and D :

A hydrated metallic salt(A), light green in colour on earful heating gives a white anhydrous residue(B). (B) is soluble in water and its aqueous solution reacts with No to give a dark brown compound (C). (B) gives a brown residue (D) and a mixture oftwo gases (E) and (F). The gaseous mixture when passed through an acidified KMnO_4 solution dischanges the pink colour and when passed through acidified BaCl_2 solution gave a white precipitate. C may be